1 //=== FixedAddressChecker.cpp - Fixed address usage checker ----*- C++ -*--===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This files defines FixedAddressChecker, a builtin checker that checks for
11 // assignment of a fixed address to a pointer.
12 // This check corresponds to CWE-587.
14 //===----------------------------------------------------------------------===//
16 #include "ClangSACheckers.h"
17 #include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
18 #include "clang/StaticAnalyzer/Core/Checker.h"
19 #include "clang/StaticAnalyzer/Core/CheckerManager.h"
20 #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
22 using namespace clang;
26 class FixedAddressChecker
27 : public Checker< check::PreStmt<BinaryOperator> > {
28 mutable OwningPtr<BuiltinBug> BT;
31 void checkPreStmt(const BinaryOperator *B, CheckerContext &C) const;
35 void FixedAddressChecker::checkPreStmt(const BinaryOperator *B,
36 CheckerContext &C) const {
37 // Using a fixed address is not portable because that address will probably
38 // not be valid in all environments or platforms.
40 if (B->getOpcode() != BO_Assign)
43 QualType T = B->getType();
44 if (!T->isPointerType())
47 ProgramStateRef state = C.getState();
48 SVal RV = state->getSVal(B->getRHS(), C.getLocationContext());
50 if (!RV.isConstant() || RV.isZeroConstant())
53 if (ExplodedNode *N = C.addTransition()) {
55 BT.reset(new BuiltinBug("Use fixed address",
56 "Using a fixed address is not portable because that "
57 "address will probably not be valid in all "
58 "environments or platforms."));
59 BugReport *R = new BugReport(*BT, BT->getDescription(), N);
60 R->addRange(B->getRHS()->getSourceRange());
65 void ento::registerFixedAddressChecker(CheckerManager &mgr) {
66 mgr.registerChecker<FixedAddressChecker>();